Episodic and prototype models of category learning

The question of what processes are involved in the acquisition and representation of categories remains unresolved despite several decades of research. Studies using the well-known prototype distortion task (Posner and Keele in J Exp Psychol 77:353–363, 1968) delineate three candidate models. According to exemplar-based models, we memorize each instance of a category and when asked to decide whether novel items are category members or not, the decision is explicitly based on a similarity comparison with each stored instance. By contrast, prototype models assume that categorization is based on the similarity of the target item to an implicit abstraction of the central tendency or average of previously encountered instances. A third model suggests that the categorization of prototype distortions does not depend on pre-exposure to study exemplars at all and instead reflects properties of the stimuli that are easily learned during the test. The four experiments reported here found evidence that categorization in this task is predicated on the first and third of these models, namely transfer at test and the exemplar-based model. But we found no evidence for the second candidate model that assumed that categorization is based on implicit prototype abstraction.     

You don't act like you trust me: dissociations between behavioural and explicit measures of source credibility judgement

This study compared explicit and behavioural measures of source credibility judgements based on two factors: a source's past record of accuracy and its production of predictions that participants would like to believe. The former is considered to be a rational factor for judging credibility, while the latter is considered nonrational (i.e., it does not predict actual credibility). In Experiments 1 and 2, participants saw an equal number of predictions from two sources, one of which was either highly or slightly more accurate/desirable than the other. In Experiment 3, either one source was high accuracy and the other high desirability, or one source was higher on both measures. For all experiments, participants then saw new accurate and inaccurate predictions and said which source they thought was most likely to produce each (behavioural task). Participants then gave a percentage rating for each source's perceived accuracy (explicit judgement task). Participants showed sensitivity to past accuracy differences using both tasks, but not to the size of the differences. Desirability influenced performance only on the behavioural task. However, when the two factors conflicted, participants responded solely using past accuracy information. Behaviours reflect source credibility judgements based on both rational and irrational factors, but participants appear to be both more strongly influenced by the rational factor and more aware of that influence.     

NEW LOSS FROM AN OLD PROBLEM: HOW COUNSELORS CAN ASSIST PERSONS WITH POSTPOLIO SYNDROME

For many persons who were diagnosed with polio years ago, late effect symptoms were not anticipated. They believed they had gone through the more severe ramifications of the illness and were unaware that additional problems could occur. Currently, there are hundreds of thousands of persons in the United States who are experiencing significant difficulties with old symptoms and are also developing new physical and emotional difficulties. Unfortunately, little research has looked at the ways counselors can assist this population.Therefore, the purposes of this study were to identify the physical and emotional problems confronting persons with postpolio and to help counselors gain an understanding of issues they feel might be most appropriate to address in therapy sessions.     

Cheat and you Lose! Don’t Cheat and you Lose! Reflections and Analysis of Accounting Student Data

During 2012 students enrolled in a Master’s management accounting unit were invited to complete a compulsory class quiz, which was arranged to include a mild form of deception allowing them an opportunity to cheat. Prior to the test students were coached concerning the importance of the ICMA code of ethical conduct, which formed the basis of the quiz. Following the test, students were made aware of the deception and asked to judge the propriety of their actions using a research instrument based on moral intensity theory (Jones in The Academy of Management Review, 16(2), 366–395, 1991). Academic dishonesty, in its many forms is endemic in universities and in this study a significant number of students take advantage of an opportunity to maximise test scores and earn an advertised reward by cheating. Others adopted a virtuous position and opted not to use the information. As reported from an earlier investigation, Woodbine and Amirthalingam (2013) again demonstrate the effect of cognitive dissonance (Festinger 1957) although previously the research instrument did not clearly differentiate between respondent types. A logistic regression of subsequent data establishes that high achievers (in terms of their test scores) are more likely to take advantage of the disclosed information to maximise scores and that this is somewhat offset by aspects of their moral character. Immediately following the field experiment, students met to reflect on their actions. A summary of their responses is provided, which tends to support prior evidence that many are somewhat blasé in their attitude to this form of opportunistic behaviour. These findings have ramifications in terms of the way tertiary institutions emphasise academic excellence before moral development, while acting to manage the incidence of misbehaviour.     

Book review

Crime and creativity

EISENMAN, R. (1991). From Crime to Creativity: Psychological and Social Factors in Deviance. Dubuque, IA: Kendall/Hunt Publishing Co. (128 pp.). ISBN 0–8403–6848–8.

A penchant for the trenchant

SCHULMAN, M. (1991). The Passionate Mind. New York: The Free Press (352 pp.). ISBN 0029281113.

The essential nature of ethical, social, and historical context in examining creativity and innovation

GRUDIN, R. (1990). The Grace of Great Things: Creativity and Innovation. New York: Ticknor & Fields, Houghton Mifflin Co. (257 pp.). ISBN 0–89919–940–2.     

Identifying Mediators of the Influence of Family Factors on Risky Sexual Behavior

Participation in risky sexual behaviors has many deleterious consequences and is a source of concern for parents as well as practitioners, researchers, and public policy makers. Past research has examined the effect of family structure and supportive parenting on risky sexual behaviors among emerging adults. In the present study, we attempt to identify the mediators that explain this relationship. Using survey data from a sample of over 2,000 college students (1,297 females and 780 males) we use structural equation modeling to investigate the role of commitment to marriage, desired characteristics in an intimate partner, and sociosexuality in linking the influence of family structure and supportive parenting to risky sexual behaviors. Results indicate that respondents from continuously married families were more committed to marriage, and this commitment reduced the probability of risky sexual behavior both directly, as well as indirectly through its negative impact on unrestricted sociosexuality. On the other hand, respondents who reported having supportive parents rated sensitivity and similarity of values as more important in a mate than physical attractiveness and sexual compatibility. This approach to mate selection reduces unrestricted sociosexuality and, in turn, risky sexual behavior. Even after taking our mediators into account, there is still a direct effect of family factors on risky sexual behavior. Gender differences in the pattern of findings are discussed and directions for future research are identified.     

The Holistic Phase Model of Early Adult Crisis

The objective of the current study was to explore the structural, temporal and experiential manifestations of crisis episodes in early adulthood, using a holistic-systemic theoretical framework. Based on an analysis of 50 interviews with individuals about a crisis episode between the ages of 25 and 35, a holistic model was developed. The model comprises four phases: (1) Locked-in, (2) Separation/Time-out, (3) Exploration and (4) Rebuilding, which in turn have characteristic features at four levels—person-in-environment, identity, motivation and affect-cognition. A crisis starts out with a commitment at work or home that has been made but is no longer desired, and this is followed by an emotionally volatile period of change as that commitment is terminated. The positive trajectory of crisis involves movement through an exploratory period towards active rebuilding of a new commitment, but ‘fast-forward’ and ‘relapse’ loops can interrupt Phases 3 and 4 and make a positive resolution of the episode less likely. The model shows conceptual links with life stage theories of emerging adulthood and early adulthood, and it extends current understandings of the transitional developmental challenges that young adults encounter.